The Campbell Hausfeld easy-to-use, 12 Volt, digital portable tire inflator takes the worry out of any roadside emergency. Simply program the desired PSI level for your tire-tractor, motorcycle, ATV, car, bike, truck, SUV or RV, connect theleak-proof threaded air hose valve and turn this little powerhouse on! The cooling fan kicks on as needed to prevent overheating and allows for 30 minutes of continuous use. Once the desired pressure level is reached, the motor automatically shuts off. An LED light helps you perform these tasks at night.